I have been trying to get around to this conversion on my 40 for sometime. After talking to some people in the club there seems to be a consensus that 33" tires are the tipping point. 33" or smaller go mini. 35" and larger go with a Saginaw. I have read about the 60 PS conversation but don't know if it would be strong enough to handle 35". I have not heard of an 80 PS in a 40 does it / can it work?

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"Keep talking. I'll keep analyzing."
"Bad decisions make great stories."
"40's are only to be sold at estate sales." - Uncle Ben